Ellipsograph.



PATENTED SEPT. ll, 1906,

C. HANESzR. H. MONTBITH.

l ELLIPSOGRAPH. APPLIGATIQON FILED NOV. 6, 1905.-

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.PATENIED SEPT. 1l, 1906. C. HANES & R. H. MONTEITH.

ELLIPSOGRAPH.

APPLICATION FILED Nov. e, 1905.

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UNITED sTATEs PATENT OEEIOE.

CHESTER HANES AND ROBERT H. MONTEITH, oF NEW RICHMOND, OHIO.

i ELLlPsoeRAPl-l. l

No. 830,784. y

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application led November 6, 1905. Serial No. 286,054.

T0 all whom it may con/cern,.-

Be lit known that we, CHESTER HANEs and ROBERT H. MONTEITH, citizens of theE United States, residing at New Richmond, in

the county of Clermont, State of Ohio, have vexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to drafting instruments, and more particularly to ellipsographs, and has for its obj ect to provide an instrument of this kind which will be adjustable to describe ellipses of different dimensions, which may also be adjusted to describe circles of varying sizes, and which may be folded to occupy little space when not in use.

Other objects and advantages will be apparent from the following description.

In the drawings forming a portion of this specification, and in which like characters of reference indicate similar parts in the several views, Figure l is a top plan view of the present instrument adjusted to describe an ellipse. Fig. 2 is a front elevation. Fig. 3 is a view, partly in section and partly in elevation. Fig. 4 is a detail view of the notched leg. Fig. 5 is a sectional view through the main clamping mechanism.

Referring now to the drawings, the present invention comprises a foldable frame including upper and lower horizontally-disposed vertically-spaced guide-plates 5 and 6, respectively, which are disposed normally in crossed relation at right angles to each other and which have longitudinally extending slots 5 and 6', respectively.

The ends of the plates 5 and 6 lie in alinement with each other transversely of the frame and are connected at one end of the frame by a brace-bar 7, having its ends turned to lie in vertically-spaced planes and against the under and upper faces of the plates 5 and 6, respectively, the brace-bar being pivoted to the ends of these plates and having fingers 7 thereon for engagement of fingers 8 and 9, carried by the plates 5 and 6, respectively, to limit the movement of these plates away from the brace-bar, these lingers lying in mutual engagement when the frame is in Operative position. The opposite ends of the plates 5 and 6 are connected by an extensible brace-bar 10, including two slidablyconnected members l1 and 12, this bracebar being thus longitudinally extensible and being pivoted to the ends of the plates at its ends.

Means (indicated at 13) is provided to hold the members 11 and 12 against movement with respect to each other. Supportinglegs 14 lare provided and are located at the points of union of the plates and brace-bar, these legs having upward extensions 15, which form pivot-pins for the plates, the brace-bars being rigidly mounted upon the legs. The leg 14, which lies at the point of union ofthe brace-bars 7 and late 5, has an inwardly-opening notch 16 t erein for a purposeto be presently described, and, as

shown in the drawings, the brace-bars have inwardly-extending end portions 7 and 11., respectively, the ivot-pins extendin upwardly through tliese portions inward y of the intermediate portion of the brace-bar.

A slide 17 is engaged in the slot 5 for movement longitudinally thereof and has an upwardly-extending Vmilled iinger-piece 18, and the slide is also arranged for rotation with respect to the plate 5. extending sleeve 19 is carried by the slide 17 below the plate 5, and a vertically-threaded passage 20 opens through the upper end of the finger-piece 18 and communicates with theinterior of the sleeve 19, a set-screw 21 being adjustably engaged in this passage.

An arm 22 -is slidably engaged in the sleeve 19, the screw 21` being arranged for operation to hold this arm at different points of its A horizontallymovement, and the arm has its forward end i lOO plate 6 and extending laterally beyond the slot 6 thereof, as does also the rearwardlyturned portion 22 of the arm 22 this rearwardly-turned portion being somewhat broadened. The pin 23 extends upwardly through the slot 6 and is slidable and revoluble therewithin.

A laterally-extending finger 25 is carried by the plate 24 and extends tlierebelow, and formed through this finger there is a passage 26, which extends radially of the plate for the reception of an arm27 having a downwardly- IlO - the combination with vertically spaced slidably engaged in the sleeve, a set-screw wardly and rearwardly turned end lying above the lower guide, aplate disposed bey operation to implnge against the arm, and a 6o 'operable to impinge against the arm^27 to being at the same time rotated to cause the directed lead-grip 28 at its forwardend. 'A set-screw 29 is engaged in the finger 25 and is hold the latter at different points of its movement within the passage 26. The 'portion 22 of the arm 22 and the plate 24, together with the in 23,form a slide A, Amovable 'longitudinal yof the plate 6, andthe pin 23 has a retaining-nut 23l ocated upon the upper end thereof. y j

In use when it is desired to describe an ellipse the arms 22 and 27 are adjusted to bring the slides to points' between their ends andthe iinger-piece 13 is grasped and moved longitudinally ofthe slot 5 The finger-piece slide A to move longitudinally oftheslot 6 as will be readily apparent, theforward end of the arm 27 will be moved to describe an ellipse. When it is desired to describe acircle, the slide 17 is moved to lie above and concentric with the pin 23, when rotation of this slide will cause the lead-grip to describe a circle, the radius of which Vmay be varied by shifting the arm 27 in the passage 26.

When it is desired to fold the present implement, the fastening means 13 is loosened and the brace-bar 1() is extended, the plates 5 and 6 being moved pivotally in opposite direc-4 tions and toward the brace bar 7. When in folded position, the plate 6 lies in the notch 16, formed in one of the legs 14, as described above. The fastening means 13 may be tightened to hold the instrument in folded position.

What is claimed is- 1. In an instrument of the class described,

guides, of a slide rotatably mounted in the upper guide for movement longitudinally of the guide, an upwardly-extending fingerpiece carried by the slidefa horizontal sleeve carried by the slide below the guide, a plate engaged in the slide for operation to im inge against the plate, said plate having a ownneath the lower guide, an upwardly-extendingpin carried by the second late and extending through the lower gui e andrigidly engaged in the rearwardly-turned end of the first-named plate, said plates bein arranged for rotation and for longitudinal sli ing movement with respect to the guide, a horizontal sleeve carried by the second plate, a horizontali-arm slidably engaged in the second sleeve, a set-screw engaged 1n the second sleeve for marker carried by the arm.

' of lthe gui 2. lAn instrument of the -`class described tensible brace-bar pivotally connected at its ends withI the other ends of the guides, said brace-bars and guides having mutually-engaging ingers disposed to revent movement es away from t e brace-bars, and means for holding the extensible ybrace-bar at times against extension.

3. An instrumentof the class described comprising av foldable frame including upper and lower spaced guides, slides removably mounted in the uides, a marker connected with one of the sides, a brace-bar ivotally connected with the end of each guidle, an extensible brace-bar pivotally connected at its ends with the other ends of the guides, said brace-bars and guides having mutually-engaging fingers disposed to prevent movement ofA the guides away from the brace-bars, means for holding the extensible brace-,bar at times against extension, and supportinglegs connected with the frame at the unions of the guides and brace-bars, one of said legs having a ynotch therein arranged to receive one of the guides when the frame is in folded position.

4. In an instrument of the class described,

the combination with upper and lower spaced guides, said lower guide comprising a plate having a longitudinal slot therein, of a slide 95 carried by the upperv guide for movement longitudinally thereof and for rotation with respect thereto, an Aarm slidably engaged' with said slide for movement horizontally, means for holding the arm at different points of roo its movement, said arm having a downwardly and rearwardly turned end located above the lower guide, a plate disposed beneath the lower guide, a in carried by the late and loosely engagedp ower guide and rigidly engaged in the rearwardly-turned end ofthe arm, said end ofthe arm and plate extending laterally beyond the slot of the lower guide, a horizontal arm slidably connected with the plate beneath 11o i the lower guide, a depending marker carried by the last-named arm, and means for holding said arm at different points of its sliding movement.

In testimony whereof we aflix our signa- 115 tures in presence of two witnesses.

CHESTER HANES. .ROBERT H. MONTEITH.

Witnesses CHAs. R. FAGIN, THOMAS J. Woons.

in the slot of the 

